You are not over-reacting, one of my pet peeves among my colleagues is carelessness. It does not matter what kind of patch it is, whether it is harmful or not. This must be discarded immediately in appropriate container and not left on the table or elsewhere. Now that I am a nurse, I noticed that so many nurses are either too busy or just neglectful or could care less to take the time to "clean up" oblivious to the fact that it could be picked up by a child and put it in his mouth. Taking the time to dispose of the like things. Safety awareness is one of our responsibilities, among other things.